Telephone equipment.



J. B. BRIGGS & v. P. HALL;

. TELEPHONE E UIPMENT.

APPLICATION FILED MAR.24, 1910.

} Patented May 7, 1912. E

7 SHEETSSHEBT 1.

a woe u fun? whine/sow J. B. BRIGGS & v. P. HALL. TELEPHONE EQUIPMENT. APPLICATION FILED MAR. 24, 1910.

1,025,366. 'Patentedma m l'z .7 SHEETS-SHEBT 2 v v .ZdJ

J. B. BRIGGS & V. P. HALL.

TELEPHONE EQUIPMENT.

APPLICATION FILED MAR. 24, 1910.

Paten'ued May 7, 1912.

7 SHEETS-J-SHEET 3.

J. B. BRIGGS & V. P. HALL.

TELEPHONE EQUIPMENT.

APPLICATION FILED MAR.24, 1910.

Patented May 7, i912.

SHEET 4.

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TELEPHONE EQUIPMENT. APPLICATION FILED MAR L 1910.

Patented May-7, 1912.

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we mw QN h 7 On v P g m2 asmees & v. P. HALL. TELEPHONE EQUIPMENT. I A BPLIUAII'ION FILED MAR. 24, 1910.

1,025,366. v Patented May 7, 1912.

7 SHEETS-SHEET 6.

hum u TED STATES rngnnr onrron.

JUDGE BAIQTER Hit-IGGS AND VERNON P. HALL, OF LABETTE, KANSAS.

TELEPHONE EQUIPMENT.

Specification of Letters Patent. Application filed March 24,1910; Serial No. 551,284.

Patented May '7, 1912.

To all it'mey concern-' v Be it known that we, Juno-n BAXTEB Bmccs and VERNON .P. HALL, citizens of the United States, residing at Labette, in they county. of Labette and State of Kansas, have invented certaih new and useful Improvements in Telephone Equipments; and we do hereby declare thefollowing to be a full,

clear, andeiiact description of the invention, sucha's enable others skilled in the art towhichitj appertains to make and, use the same.

'Our invention relates to' new and useful improvements in telephone equipments and,

is more particularly to be used in connection with systems having party lines and our the party called, from listening or cutting in on the line after the proper connections have telephones.

. annunciator with the dial removed. Fig. is a detail plan View partly in sectionof a object is to provide means for calling any particular party upon saidline without disturbing the other parties. a

A further object is to provide means for preventing any of the subscribers otherjhan been made. I I

-.A further object is to provldea, suitable selecting mechanism for operating the calls ing telephone and telephone being called.

, A further object is to'provide means for operating said selecting mechanism. A further object is to provide suitable cut out mechanisms whereby the circuit .Will be broken between the operating and dormant- A further object provide means whereby all of the telephones may be -simultaneolrely called and used for talking purposes. 1

Other objects and advantages will be hereinafter referred to and more particularly pointed out in the specification and .claims'.

mechanism complete. Fig. 2 is an elevation of the telephone showing the manner of wiring the interior thereof with the door of the telephone box in its open position. a Fig. 3 is an elevation of-one form of dial for the annunciator box. Fig. 4 is an elevation of the trip lever used. in connection with the selecting mechanism. F1g.-61s a rear elevation is to provide suitable indicating means to designate what telephone 1 is being called, and, a further object is to of the selecting mechanism with the casing removed. Fig. 7 is a perspective view of a disk used in connection with thpselecting mechanism, Fig. 8 is a central transverse anism. Fig. 14 is, a sectional view of the indicator mechanism showing the manner of wiring the same. Fig. 15 is a detail view of a circuit making and breaking armature lII-ltS lowered positlon. Fig. 16 1s a similar view. showing the position of the armature when attracted or raised. Fig. 17 is a similar view showing parts of the disk of the indicator mechanism engaged with parts thereof. Fig. 18 1s a similar view showing the disk engaged with other parts of the armature.

Fig. 19'is an elevation of the armatureand a section of the disk showing the-armature in its lowered position. Fig.

20 is a similar view showing the armature in its attracted position. Fig.2l is an elevation showing the parts Tof the armature engaged bythe disk, as shown in Fig. 17.

Fig. 22 is a side elevation of the armature and disk showing the disk. engaging the parts of the armature, as indicated in Fig. 18. Fig. 23 is atop plan viewof the arms.- ture. Fig. 24 is an elevation ofthearmature and parts of the indicating mechanism in their operative positions, and Fig. 25 is a diagrammatic view of a system comprising three telephone instruments, showing two of said instruments in use.

Referring to the drawingsdn which simi lar reference numerals designate corresponding parts throughout the several views, 1 indicates the telephone boii which may be constructed in the usual or any preferred manner and 2 indicates the usual-form of call box in which is located my improved indicating and selecting mechanism. Located within the call box 2 are electromagnets 1, 2, 3, 4: and 5, the magnets 2 and 3 00-- operating with each other as do the magand armature being.

' openings 23 nets 4: audio, the magnets 2 and 3 being bridged betyveenthe line and ground, while the magnets. Land 5 are placed-in the gen erator circuit between the generator and the ground.

w The magnet 1 is preferably positioned above the magnets 2and 3, while the mag?" nets 4 and 5 are positioned below the magnets 2 and 3, said magnet 1 being hollow and provided with a tubular sleeve 6, which sleeve extendsentirely' through the magnet 1 and has one of its ends provided with a' in a depression 12 in the outer end of the shaft.

Fixed to the extended end of the shaft 10 is an ar1nature-1 3,the. l ower end of'awhich passes between metal i-plates 1 1 and 15 attached to the cores of the magnets? and 3-. the meeting ends of said. plates; terminating on opposite sides vof the .arma-f whereh'ywhen an alternating current is directed. through the magnets 2 and 3, the armature moved back.-.-and the plates, shaft;

respectively,

ture 13 and a distance therefrom,

13 will be agitated and forth between said plates,

' formed} of soft *irp'n',

thus rendering them magnetic.

Mounted upon a horizontally disposed .shaft 16 and at the opposite ends of the magnets, above desci'bed 'isa disk 17, the peripheral edge of whichis provided with a plurality of blade-like rojections 18, while attached to the inner ce of the disk 17 is a ring 19, the inner edge of which is provided with notches20 and 21. Extending laterally from the peripheral gedge of the ring 19 are segmental flange sections 22, which sections are spaced a art to form for a purpose to g setforth, the ends of said segmental sections being substantially V shaped as shown at 2A:

. for a purpose which will likewise be hereinafter set forth.

The disk 17 is operated through the medium of a pawl 25, which (pawl is pivotally attached to the upper en of a shank 26, which shank is in turn fixed to a rod 27, said rod being rotatably mounted within the call box 2 and adjacent the bottom portion thereof by engagement with the adjusting screws 28. The pawl is adapted to engage the rojections 18 and one of its ends is he d in t 1e path of the projections by means of a spring 23 so that the end of the pawl engaging the projections Wlll readily descend e hereinafter thereof and will immediately arise to engage the faoe of the projection as soon as it. has passed beyond the end of the pawl. The pawl 25 is rocked back and forth to successively engage the end thereof with the projections on the disk 17 by attaching to the end of the rod 27 farthest from said pawl, a shaft 30, the upper end portion of said shaft being threaded to receive a threaded sleeve 31, said sleeve having a finger 32 attached thereto which is adapted to engage a slot 33 in the lower end of the armature 13 so that when moved back and forth through the medium of the alternating current passing through the coils 2 and 3, the rod 27 will be rocked back and forth, which will likewise swing the pawl into engagement with the projections on the disk 17 and as the pawl is successively engaged with said projections, the disk 17 will be rotated thereby. As the pawl is required to rotate the disk when moved in one direction, the attraction of the energized plate 14: would not be sufiicient to move the armature toward the plate 14- and for this reason a springE-is provided, one end of which is attached to the armature and the-opposite end to anadjnsting screw 35,, thetensionof said spring being such as o compensate for, the resistance of the .disk lfl j I The disk 17 is held against reverse rota- -,tion by-aneans ofan auxiliary pawl 36 which is mounted similarly to the pawl 25 upon a standard 37, said auxiliary pawl engaging the rear face of the projection as the main pawl has completed its forward stroke. In the present instance, we have shown a system comprising seven telephones or stations and upon the outer face of each disk 17 are placed eight stop blocks 38, which stop blocks are adapted to engage the latch end 39 of a trip lever 40 and stop further rotation of the disk, until the blocks are released from the lever. In order to ascertain when a particular telephone is in position to be communicated with or what patrons are using the line, the froiit end of the box 2 is provided with a dial 41, on which are placed divisional numerals from 1 to 7 consecutively together with a space marked All and permit the projections to pass the end said armature is and cooperating with said divisions is a swinging movement of the latch end of the.

45 is slightly larger than the pin so that:

said lever-can have a lateral movement as well as a vertical movement, the upward lever being regulated by means of a stop 46 with which the rear end of the trip lever engages when the lever'is moved to a hori zontalposition and said trip lever is normally held in its elevated position by means of a spring 47, one end of which is fired to parts. of the casing in the box 2, while the opposite end thereof exerts upward pressure against the bottom of the trip lever. The latch end 39 extends between pins 48 and 49, which pins limit the lateral swinging movement'of the end of the lever and by providing an offset portion. 50 adjacent the i the stop blocks. As soon as one of the stop blocks moves into engagement with the latc 39 and the latch is moved laterally until it' engages the pin 48, furtherrotationof the disk 17 is stopped, until such time as the latch is disengaged from the stop block and this result is accomplished through the medium of asliding armature '53, the arms of which extend through a block 54 fastened to the front face of a plate 55 at the forward ends of the magnets in said-box, sald block being formed of soft iron and forming part of the yoke. connecting electromagnets 2 and 3.

The body of the sliding armature is suhstantially in the form of an oblong link and is provided at its lower end with a depending foot 56, the lower end of the foot being provided with a roller 57, which roller is adapted to cinga e a treadaplate 58 on the trip lever 40 so t 1at when the sliding armature descends and the roller engages the tread plate, the latch end of the lever will be lowered and moved out of the path'of the ends of the stop blocks.

The spring 51 will normally swing the trip lever laterally to move the latch end 39 against the pin 49, but by. inclining the tread plate 58 and placing the lower end thereof" on the side of the trip lever opposite the. spring 51, the en agement of the roller 57 with said tread ate will cause a side pressure thereon, sai side pressure assisting the spring 51 in. moving the trip lever laterally in one direction; After the trip lever has been disengaged from the stop block, an alternating current is directed into the coils 2 and ,3 through the medium of the The trip lever normally rests against usual or any preferred form of generator 59 or other -mechanism located preferably in the telephone box causing the magnetic polarity of plates 14 and 15 to alternate asthe direction of the current from the generator alternates and a continued operation of the crank '60 of the generator will agitate the armature 13 and cause the pawl 25 to rotate the disk, 17 until the next su'cceedingstop block 38 is moved into'engagement with the latch 39. The stop blocks engage the" latch adjacent the pin 49 and move the tri lever laterally until the latch end engages the post 48, when further rotation of the disk is stopped until the sliding armature is again lowered and the latch released,

The sliding armature 53 is elevated primanly by attraction and to accomplish this result, a block '61 of soft iron is attached to the forward end of the sleeve 6 by en gaging a portion of the threads of the nut 7, the upper end of" the sliding-armature having an upwardly extending shank 62 which projects through an opening 63 in the block 61, said shank serving to properly guide the upper end of the sliding armature; The block 61 is electrically energized by energizingthe magnet 1 and such operation v occurs nearly simultaneously with the energizing of the coils 2 and 3. Assoon as the coils 2 and?) are en'ergized,the plates 14 and 15 become magnetic, an armature 64 carried by a ivoted lever 65 is attracted to the plate 15, .t e upper end of the lever 65 being drawn into engagement with the contact point 66, which is in turn wired to the magnet 1, such wiring to be hereinafter descr1bed. Assoon as the contact point engages the lever 65, the current immediately passes into the magnet 1 and energizes the block 61, such ener elevating the sliding armature 53 and hailing the same in this position until the circuit is broken and they ever 65 moved away from the contact point 66. As soon as the coils 2 and 3 are deenergized, the plate 15 ceases to be a magnet, and the lever 65 will be swung in the opposite direction or away from the plate 15 by means of a weight 67, which is adflustably. mounted upon a stem 68 extendin laterally from the lever 65, said lever eing moved into engagement with an additional .contact point 69', this operation closin a oircuit," the object of which will be heremafter set forth. i

The sliding armature53 is assisted in its upward movement byatt-aching thereto one end hf a swinging beam Z0, Saidbeam'bel ing mounted in a strap 71 surroundin the- .magnet 1.- The opposite end of} the. cam 70 hasattached thereto a spring 72, which spring is intm-n attached to a part, ofthe' casin cfthe cox 2 and while the tension- "of saldI spring is not sufiicient to raise, the

slidingiarmature, yet materially assists in doing so when theblock 61 is energized. The armature 53 normally descends by gravity, but to cause a positive descent thereof, one end of a spring 73 is attached to the upper end of said armature, while the opposite end of the spring is attached to an adjusting shaft 74 by a flexible connection 75 and as the end of the shaft 74 projects through the wall of the box 2, aminute adjustment of said spring 73 may be obtained by rotating said shaft and winding the flexible connection onto or off of the shaft. 7

The magnets 2 and 3 are bridged between the line and ground in the usual manner, while the electromagnets 4 and 5 are placed in the generator circuit between the generator and the ground. The magnets 4 and 5 are designed so as to respond quicker than the magnets 2'and While the magnets 2 and 3 in all of the telephones .on the line will be energized, the magnets and of the calling. telephone only will be magnetized. The introduction of an electric current into the magnets 4 and 5 will cause the projecting cores 75' and 76 to attract a cross arm I -7 7 of an armature 78 and lift said armature to ahoriz'ontal position. The rear end porion of the armature 78 is pivotally mounted in a portion of the frame work of the box 2 and has attached to its extreme rear end a spring 79, which spring is employed for assisting in elevating the armature. The

swinging movement of the forward end ofthe armature 78 must be rapid and to this end a spring is attached to the armature 78 between its pivot point and the end carrying the cross arm 77 so that immediately the current is cut out ofthe magnets 1 and 5, the forward end of the armature will be "quickly lowered profiding the end of the armature is in alinement with one of the openings 23 in the ring '19.. The tension of the springs 79 and 80 is such that the armature 78 normally rest-s in its down position. By providing opposing springs 79 and 80 the armature 78 will start to move quicker both downwardly and upwardly than would without such an arrangement. As .the armature moves from eitheinone of its limits of travel 'tothe other,'the pulling power of one spring constantly increases,

\ while the pulling power of the other, constantly decreases.

The armature 78 extends beyond the cross arm 77 and, is provided at its outer end with a roller 81, which roller is. adapted to 1 engage either the inneror outer faces of theflange 5601310118 onthe ring 19, said engagement depending upon whether the areonnatu're is elevated or lowererd. Projecting v above 'andtbelow the armature 78 and carried thereby are extensions 82 and 83, in which extensions are pivotally mounted auxiliary armatures' 84 and 85 respectively, the outer ends of said ahxiliary-em'natures having rollers 86 and 87 thereon, which rollers are in alinement above and below the roller 81 and engage respectively the inner and outer faces of the flange sections when the armature is moved to certain positions.

Carried at the outer ends of the extensions 82 and 83 are rearwardly extending frames 88 and 89 and between said frames and the armature 78 are positioned contact plates 90 and 91 respectively, said contact plates being spaced from the armature and frame sections by suitable insulation 92 and 93 respectively. The forward ends of the contact plates 90 and 91 are so positioned as to be engaged by the inner ends of the. auxiliary armatures 84 and 85 respectively,

the auxiliary armature 84 normally engaging the contact plate 90, while the auxiliary armature 85 is normally out of engagement with the contact plate 91, said auxiliary armatures being so held by means of springs 94 and 95.

. Positioned above the frame section 88 and insulated from each other and from the. frame section are contact plates-96, 97, 98 and 99, the contact plates 96 and 97 cooperating with each other, while the plates 98 and 99 also cooperate with each other. The

forward ends of the contact plates 9G and 9 97 are provided with buttons 100 and 101 respectively of insulating material, the button 100 being on the upper face of the contact plate 96, while the button 101 is below the contact plate 97 and in position to engage the contact plate 98 so that when a downward pressure is applied tothe forward ends of said contact plates, the circuits will be closed between said sets of plates by the bringing together of the ends of the plates 96 and 97 and the ends of the plates 98 and 99. The forward ends of the contact plates 98-97 and 98-99 are brought together by means of a foot piece 102 on the sliding armature 53, which foot piece extends in the path of the forward ends of said plates.

Extending forwardly and downwardly from the lower end of the armature 53 is an arm 103, which arm is adapted to enter one of the notches 20 or 21 under certain conditions and rest uponthe edge of the ring 19 under other conditions. When the arm 103 engages the edge of the ring 19, the foot 102 will not engage the contact plates suliiciently to close the circuits between the same when the armature 78 is in its lowered position, but will close said circuits even when resting upon the edge of the ring when the armature is in its elevrted position. as shown in Fig- 24 of the drawings. Each of the rings in theirrespeetive telephones is provided with the notches 20 and 21, but the notches 21 are so arranged that no two notches will he. in position to receive the arm 103 at the same time, while the notches 4 and 5 'of'the in Figs. 18 and 22.

make a rearward stroke before engaging an the ground, thence returning onto the passesfrom the generator, 59 through wire 1 .104, binding post and wire 105, wire 106 to {'5 are similarly .th wire 111 extending} from the magnet? F-toisaid armature 78 and the wire 110-ex;

20 are so arranged that when the hand 42 is rotated until it registers with the word All on the dial, the arm 103 of each telephone will drop into its respective notch 20,-in which event all of the telephones can be simultaneously called and communicated with.

In describing the operation of the device, attention is particularly called to Figs. 1, 2, 14 and 25 of the drawings. In starting to make a call, the crank 60 at the calling telephone is rotated, which will create an alternating current and energize the magnets 2 and 3 by Way of wire 1140f an the telephones on the line and energize the magnets calling station only, which will result in rotating all .of the disks in the various telephones. The energizing of the magnets 4 and 5 in the calling telephone will result in raising the armature78 and cause the flange sections 22 to pass between the rollers 81 and 87, as more clearly shown in Figs. 17 and 21, thus forcing the inner end of the auxiliary armature 85 into engagement with thecontact plate 91 and completing the circuit therethrough. The flange sections 22 of all the telephones other than the calling station will pass between the rollers 81 and 86, thereby lowering the inner end of the auxiliary armature 84 and breaking the circuit between said auxiliary armature and the contact plate 90, as shown So long-as magnets 2 and 3 are not energized, the armature 13 will be held adjacent the plate 14 by'means of the spring 34, thereby holding the pawl 25 in its forward stroke or position, thus necessitating the pawl to additional projection on the disk 17 and giving the armature 78 sufiicient time to" rise and pass through one of the openings 23, said operationbeing completed before the disk 17 starts to rotate. The current the line wire 107 through theother instruments'other than the calling telephone to ground wire 109 of the calling instrument,

82, auxiliary armature 84, contact plate 90, wire 112, post 115,"wire 116, circuit'breakcr" 117, wire 118 to the generator 59. The

114 extending from the wire 106 to the=magnet 2 and a wire 113 extending ire/m the ground wire 109 to the magnet 33, while the coils-4 and bridged between "thwarmature 78 and the ground ivire 109thi ough tending-Jroxngthe ground wire'109 to i magnet 4, in which instance apart of the currentwill pass from wire 106 through wire 114, through the coils- 2 and 3 at the calling instrument, wire 113, wire 109, through wire 110, coils '4 and 5, wire 111, armature 78, extension 82, contact plate 90,

'- wire-112 and posts 115 through wire 116, a

circuit breaker 117 and a wire 118 to the generator 59 causing the coils 2 and 3 and 4 and 5- tobecome magnetic at the same time.

After the flange sections in the calling telephone have moved to .the position shown in Figs. 17 and 21, the inner end of the auxiliary armature 85 will be moved upwardly and into engagement with the con tact plate 91, in which instance the current from the generator passes through wires 104, 106 through all the other telephones on the line, thence to the ground, from whence it enters the calling telephone through the ground wire 109, through wire 119 and into contact plate 91, thence through auxiliary armature 85, extension 83, armature 78, extension 82, auxiliary armature 84, contact plate 90, Wire 112 and back to the generator. circuit at the calling station, the introduc In view of the division of the tion of the flange section between the rollers 81 and'87 will cut out the coils 4 and 5, the circuit passing as above described. 'In all of the telephones other'than the calling telephone, the'armature- 78 remains in its lowered position so that the flange; sections of the disk will pass between the! rollers 81 and 86, forcing the inner end of the auxiliary armature 84 out of engagementwith the contact plate 90 and breaking the circuitto the generator at this point.

When the currentfrom: the calling station "leaves the generator through thewire 106- and enters the line wire 107 it is conducted through all of the telephones except the --call ing,,-telephone through wire 106 by wire 114 into the coils2 and 3, t-hence'into the wire 109, through the wire 113 and into the ground through the ground wire 109. The current then passes through the ground to the ground wire'109 of the calling telephone and back to the generator; As the circuitfrom the generator 59- when returning passes through the wire 112, the breaking of the connection between. the auxiliary armature 84 and the contact plate '90 through the introduction of the flange betweenth rollers 81 and 86 will prevent the use of the telephones other than the calling station and the called station. This device absolutely prevents anyone from cutting in on the line when in'use or listening to any. converse tion, as. the receiving portion of the telephones notin use, is dead. The stop blocks on thefdisk are :so arranged that when the-hand is midway between any two numerals on the dial, ne of said stop. blocks will.have moved;

into engagement with the latch end of the lever 40 and by so placing the stop blocks,

v the none of the openings'21 will be in position to receive the arm 103, but said arm 'wihl always land upon the edge of the ring 19 and prevent the ringing of thehells when the push button is operated to release the lever 40 from the stop block. The spaces midway between the divisions or numerals are indicated by 0 so that the 'operator can always tell when it is necessary to operate the push button to release the disk 17 to permit said disk to further rotate. As the blocks 38 will engage the trip lever at a point midway between the numerals or the word All and the numerals at opposite sides thereof, all of the disks will be stopped at the same relative point or when the hand on the dial is at '0 and as the pawl 25 continues to operate even after the blocks are engaged with the trip lever, any disk which may have lagged in rotating from one 0 to the next wpuld be brought up to its normal position with the other disks. This operation insures that the notch in the ring of the called telephone will always be in position to receive'the arm ot the sliding armature when the hand is turnedto the numeral indicating the called telephone and all the disks positioned to berelhased simultaneously when the circuit is broken.

In calling a station should the hand 42 be at 0 before 1 and .it is desired to call a station 4, the generator is operated, which'will energize the magnets 2 and 3 and vibrate the armature 13,- which will result in successively bringing the pawl25 into engagement with the projections 18 and rotating the disk 17 until the next succeeding stop block 38 is moved into engagement with the latch 39 and the trip lever 40 moved laterally into enga ement with the pin 48. The first stop wil occur when the hand moves into registration with the 0 before 2 on the dial and the next stop at the v 0 before 3 on the dial so that in order to continue the rotation of ;the disk 17 will be necessary to either stop the operation of generator or depress the push bptton 117,eitlier or which willresult inbreaking the circuit of the generator through all the magnets 2 and 3 and :atthe same time demagnetise uie'magnet l,whereupon the sliding armature will descend and release the latch fromthe stop block engaged therewith. The pawl will then engage others of the projections 18 and rotate the disk until the hand reaches the numeral et," the station being called when the push button is operated tobre'a'k the circuit or the rotation of the generator is stopped, either of which will re .sul't in lowering all of the sliding armatures 53 and entering the arm 103 of the armatureat station 43 into the notch 21 of the ring ture 53 will rest upon the edge of the ring.

The stop blocks 38 are placed in aline- "ment with one of the projections on the disk 17 and are so positioned that when the end (if the lever 10 is in engagement with the pin 48, the pawl 25 will not swing rearwardly a sufficient distance to on re the next succeeding projection, but'will play between the projection in alinement with the stop block 38 engaged with the latch and the next succeeding projection so that even though the rotation of the disk 17 is stopped the armature 13 and parts operated thereby may continue to operate. When the plate 15 is magnetized, the :11- mature 6 is attracted and the lever moved into engagement with the contact point 66 and extending from said contact point to the magnet 1. is a wire 121. The current for the magnet 1 is taken directly from the local batteries 120 through a wire 122, the receiver hook I-l, contact plate 123, wire 124:, binding posts and wires 125 wire 126 to the pivoted end of the lever 05 and into the magnet 1 through the wire 121. The. circuit is completed back to the batfrom magnet 1 to the binding posts and wire 128, thence through a wire 129 to the batteries 120. The current passing through the magnet 1 will energize the sleeve 6, shaft 10 and armature 13 and will likewise magnetize block 61, whereupon the sliding armature will be attracted and held in its elevated position until such time asthc magnet 1 is demagnetized. As soon as the hand l2 has reached the nuineral 1 indicating the station being called, the notch 21 in the ring 19 at that telephone will be in position to ;receive the arm 1.03 and in View of the fact that said arm descends into said notch 21. the foot 102 will engage the insulating buteton' 100 and close the circuit between the contact plates 96 and 97 and 9S and 95), al-

though the armature 78 is in its lowered positi'on. The arms 103 of the remaining tclc- 1 phones along the line wlll rest upon the Hiner edge of the ring 19, thus pfeventing the 'foot 102 from engaging the utton 100 in all of said telephones except the calling telephone. The foot 102 of the calling telephone will engage the button. 100 and close the circuit between the contact plates MS-and 97 and 9-8 and 99 although the arm 103 does engage the inner edge of the ring 19, as in this instance the armature 78 is in its clevated'position, thus bringing the ends of" the contact plates 96-97 and 9899 in position to be depressed ;by the foot 102; k

As' soon as the magnets 2 and 3 are demagnetized the armature 61- will be released from the plate 15, whereupon the weight 07 on the stem 68 will swing the lever '05 away 19, while the arms of the remaining armfis teries 120 through a wire 127 extending cu-it passing from the batteries 120 through 1 wire 122, hook H, contact plate 123, wires 124, 125 and 126 to the lower end of the lever 65, through said lever, contact "point from the contact point 66 and into engagement with the contact point 69, where it is held'until such time as the magnets 2 and 3 are again magnetized. By depressin'gthe ends of the. contact plates 98' and 99 until they are. brought together, the circuit be-' tween the batteries and bells on the calling and called telephones will be closed, the cirmoved to such position as to prevent the hook moves away-from direct'rifitat'itith broken, as above described. If it is desired operation of the various parts of the 'cut out system. When the naceiver is removed from the hook H, the" upper end of\said the plate 123, thus interrupting the bell cuit. When the hookreaches the upper position it closes the circuit between the contact plates 135,136 and 137, which platesform a closure for both the primary and sec-v ondary circuits of the telephone.

In order to more clearly show the circuit arrangement of a 1' more particularly to mechanisms of three stations A, B and C are shown. Referring to Fig. 25, the selecting mechanism of station A has been operated to call station 0. As will be seen in the diagrammatic representation of sta-- tion C, the notch 21 of the disk thereof is positioned under the arm 123, so that said L arm has dropped into said notch, thus permitting the foot 102 to depress the contacts 96-97 and. 98-99, whereby the transmission and bell circuits are closed at such,

points. It will also be seen that the arma ture 78 has been raised in. the callingtelephone (station A) s0 that the contacts 9697 and 93 -99 carried thereby, are depressed, although the sliding armature can I135, 136 and'137; through wire' 138,- trans 'mitter Tywire 139 to the primary coil of the induction coil 140, thence through wire ,141,

wire 129 and back to the battery 120, the circuitbeing the same in both the calling and alled'telephones. In tracing the secondary fplurality of telephones circuit from the calling to'the called station and back to the calling station, said. circuit passes from the secondary coil of the induction coil through wire 142, contact point 136, contact point 135, wire 143, Wire 144, through wire 145, contact plate 97, plate 96, wire 146, wire 106, thence through line wire 107 to the called telephone, in reverse order through said called telephpne to the secondary coil of the induction coil, thence through wire 147,. receiver v134, wire 148, wire 149 to' the ground wire 109, thence af 5 A through the ground to calling instrument,

on to the wire109 through Wires 149, 14 8,

receiver 134, wire 147 to the secondary'ooil.

of'the induction coil, said induction ing the originating point.

In all of the telephones except the callin' and called telephones, the bell circuit is coil bebroken between the contact plates 98 and 99 and the telephone circuit between the contact plates 96 and 97, consequently the bells liipon said telephones other than the calling I and called telephones will not ring, nor

could the patrons at said telephones hear the conversation even. if the receiver was held to the ear, as'both circuits would be to call all of the patrons on the telephone at the same time and communicate with all of ing armature 53, so that the circuits will be established through all of said teiephonesl It will thus be seen that We have provided a positive and accurate means for selecting, any particular telephone in the line of telephones and one that can be easily operated. It will further be seen that when the telephone has been properly selected, no other telephone on the line can out in or listen to the conversation and the bells of the calling and called telephones will he the only ones to ring It will likewise be seen that the device can be cheaply'installed and practically indestructible from ,use and it will further be seen that all' of said telephones may be called and communicated with simultaneously, when desired It will further be'understood that suitable mechanism may be provided for calling and op erating the telephones through a suitable switch board, but as said construction really -forms no part of my invention, it is not deemed necessary to show or describe the same. 7

What we claim is z- 1 1. Thecombination with a plurality of telephones and Wires connecting said telephones, of rotatable disks, means to rotate said disks, means to automatically stop the rotation of .said disks, means cotiperating with parts of said disks to make and break controlling circuits and additional means to establish communication between any two of said telephones or all of said telephones.

2. The combination with two or more telephones and connecting wires therefor; of a rotatably mounted disk in each telephone, controlling magnets for each of said disks, means to direct an alternating current through said magnets, an oscillating armature associated with each disk and consaid disk at predetermined points, a pair of magnets, means to energize said magnets, an armature adapted to be attracted by said magnets and means on said disk cooperating with parts on said armature adapted to make and break circuits.

4. A selectingmechanism for telephones comprising a disk, a generator, means controlled by said generator adapted. to rot-ate said disk, means to interrupt the rotation of said disk at intervals, means to break the circuit between the generator and disk rotating device, means to release said disk. for further rotation, and additionalmeans to electrically control said releasing means.

Aselecting mechanism for telephones,

means to stop the rotation of said disk at predetermined points, a sliding armature cooperating with said disk adapted to disengage the stopping mechanism from the diskv (3. A selecting mechanism for telephones, comprising a disk, means to rotate said disk, an armature having contact points thereon, a sliding armature, means on said sliding the diskis in any position. compr sing a disk, means to rotate said disk,-

armature adapted to engage and close certain of said contact points and means on said disk adapted to engage others of said contact points and make or break the circuits therebetween.

7. In a telephone system, the combination with aplurality of transmitting and receiv ing instruments, of a selecting mechanism associated .with each instrument, comprising a disk having a ratchet thereon, electromagnetically operated means associated with said ratchet to rotate said disk, a plurality of stops on said disk, means to engage said stops to periodically check the rotation of said disk, and additional means to release said last mentioned means.

8. In a telephone system, the combination with a plurality of telephones, of a selecting mechanism, comprising a disk, electromagnetically operated means to move said disk into desired positions, a stop to interrupt the movement of said disk at. intervals, means to trip said stop, electric contacts and 7 means associated with saiddisk adapted to close said contacts when desired.

9. In a telephone system, the combination with a plurality of telephones, a selecting mechanism associated with each telephone, comprising a, disk having a flange thereon, said flange having a portion cut away, contacts adjacent said disk, an armature adapted to enter said cut away portion and close said contacts when said disk isin a certain position and means associated with each selecting mechanism to raise the contacts ofits selecting mechanism into position to be operated'bysaid armature when Intestimony whereof we have signed our names to thisspecification in the presence of two subscribing witnesses.

JUDGE BAXTER names. VERNON r, HALL.

, Vitnessesz' I CHAs. CRAGG, L. RUDE.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents.

Washington, D. C. i 

